Modernization and the Randomization Shift For decades, the predictable structure of SSNs made them vulnerable to guesswork and identity theft, as scammers could reasonably infer a person's birthplace and age based on the digits. The SSA cross-references your birth certificate, passport, or alien registration number against government databases to verify eligibility.
Understanding SSN Determined Geographic Regions
This change severed the direct link between the Area Number and geography, meaning that how is your SSN determined today is largely a matter of random assignment rather than a reflection of where you were born. The first three digits, known as the Area Number, were originally assigned based on the state where you applied for a card, with lower numbers issued to residents of the East and Northeast and higher numbers going to those in the West and Southwest.
Additionally, the SSA reserves specific Area Numbers for particular groups; for example, numbers beginning with 900-999 are designated for individuals who entered the country under the Deferred Action for Childhood Arrivals (DACA) program. If you were born before 2011, your number likely follows the old geographic structure.
Understanding SSN Determined Geographic Regions
Finally, the last four digits you recognize are the Serial Number, which runs consecutively from 0001 to 9999 within each group, ensuring that every card issued in a specific region and batch remains unique. This geographic layer allowed clerks to route applications to the correct regional office before digital databases existed.
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